See also: How to manage applications

An application is typically something that’s installable, such as a database. However, there are exceptions. It’s possible for charm authors to write a charm that treats a collection of utilities that are presented to the controller agent as a single application.

Applications are managed by charms. When operators signal updates, such as configuration changes, new relations, upgrades or removal, the charm’s hooks are triggered.

An application contains one or more units and is always hosted within a model. Applications have non-exclusive access to their units, as a placement directive can place multiple applications on the same unit.

Interaction between applications is handled by relations.

Before Juju 2.0, applications were known as services.

Last updated 3 days ago.